/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/ToolSceneQueriesUtil.h
visual angle between two 3D points, relative to the current camera position
namespace ToolSceneQueriesUtil { double ToolSceneQueriesUtil::CalculateViewVisualAngleD ( const [FViewCameraState](API\Runtime\InteractiveToolsFramework\FViewCameraState) & CameraState, const FVector3d & Point1, const FVector3d & Point2 ) }